Sending E-mail with arduino DUE + ENC28J60

Projects Programming
1

I am having trouble with sending an e-mail with my arduino...
I have my ENC28J60 breakout board connected to the SPI header on my arduino. The CS pin is connected to pin 10.
Now I am using the default E-mail sketch from the arduino playground. As smtp server I use smtp2go: smtpcorp.com on port 2525.
I have tried using this sketch with the standard ethernet library but that didn't work. After reading a bit on the forum I saw that I had to use another lib for my DUE. So I switched to the UIPEthernet library for the arduino DUE.
The output I get now is:
Ready. Press 'e' to send.
connected.
ÿÿÿÿÿÿÿ => this never ends...

The ÿÿ characters are from the Serial.write(thisByte) in the while(client.available()) loop. This loop never quits and he keeps printing thisByte over and over again... I don't really know why.
Another thing to mention is even if I disconnect my ENC28J60 it still says connected. Super weird...
But I have tried some DHCP sketches and other client sketches and they worked! I could connect with telnet to my arduino and I got response from it. So my ENC28J60 is working...

2

Ok so I tested different sketches for my ENC28J60 and with the UIPEthernet library some of them work perfectly. Only the one with this code in it:

      if (client.available()) {
        char c = client.read();
        if(DEBUG){Serial.print(c);}
      }

fail.
I have no idea why. Is someone who can help me with why all the sketches with this in them fail?